qt: tighten webkit dependencies

webkit needs shared library and gui support to build, so make that visible
in Config.in.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/qt/Config.in

@@ -335,11 +335,16 @@ config BR2_PACKAGE_QT_NETWORK
 
 config BR2_PACKAGE_QT_WEBKIT
 	bool "WebKit Module"
+	depends on BR2_PACKAGE_QT_SHARED
+	depends on BR2_PACKAGE_QT_GUI_MODULE
 	depends on BR2_PACKAGE_QT_NETWORK
 	help
 	  Build the WebKit module.
 	  If unsure, say n.
 
+comment "WebKit needs shared library/gui/network support"
+	depends on !(BR2_PACKAGE_QT_SHARED && BR2_PACKAGE_QT_GUI_MODULE && BR2_PACKAGE_QT_NETWORK)
+
 config BR2_PACKAGE_QT_JAVASCRIPTCORE
 	bool "JavaScriptCore JIT compiler"
 	help